c++

6. Write a function that will receive a character string as a parameter. The function will search the string and will replace all upper case characters with lower case and all the lower case characters with upper case characters. For example if the original string is: "I am a student at BMCC", it will become: "I AM A STUDENT AT bmcc" optional: flip the String it will become: "I AM A STUDENT AT bmcc" "ccmb TA TNEDUTS A MA 1